I once thought of some kind of Outwitters and soccer thing combined, only the ball is a bomb. You have to spawn units to kick a bomb to the opponent's base. The distance of the bomb's travel is equivalent to the damage inflicted to move it. You can select a space to move the bomb to, across pits and friends, but not enemies or obstacles. And, a quite possible rule, the bomb will explode on its own after a certain number of turns. It doesn't seem like an ideal game mode to the Outwitters environment, but it was fun to share.

If balancing more teams is a problem, there could be a different game pool for certain teams. So like the teams that struggle balance wise never face each other because they never match up with those they have an issue with.

Team set A: scallywags, feedback, Adorables, veggienaughts
Team set B: 4 new teams
And more

So when a game is started with teams from a certain set, they will only be continued with an opponent that also started with a team from a certain set.
This is kind of like a different "mode" but still same gameplay, just different options.